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= -,iq,��..ni�,N.�;l..u,r--. �� -� . . <br /> :�ni��_;DI) . rr:a�e.�.�a • <br /> _ i•.iiUrn:i���diti.i�!f� � . <br /> MEM'ORAND UM � ' . � . <br /> ;,;�,v • <br /> PROJECT: Fritz Addition Planning . � ' <br /> I'.•I�r,;.-�.t•i.;;u•, . <br /> 3848 North Sltore Drive Civil Engineering, • <br /> Loucks ProjectNo. OS-018 ��,,` -•''.`..,'.,.�:;':' � � <br /> PlatNo. OS-3161 Land Surveying <br /> h��rt�.�:^L,u:•I:.,i n,.l,i::.r,!.,:�nn <br /> Landscape Architecture <br /> TO: Tom KeUogg ::L:,�,.�,��<<I.:•rnci.u;.u�.c��iu <br /> Environmental <br /> FROM: Nicholas Man»el <br /> DATE: December 22, 2005 �-�� � •��� �� -� ������������ <br /> SUBJECT: Site P(an Review Comments and Storm water Management Plan <br /> We have responded to your site plan review cominents and included updated plans and a storm water <br /> management proposal. The revisions incl�cde changes to tl�e retaining wal! to accommodate the <br /> required setback, driveway grades modification, and sa��itary sewer modification. The storm.�vater <br /> managemei�t proposal addresses the need for storm water rate and quality control. <br /> The existing site is wooded and co.ntains wetlands in the western portion. There are currently three <br /> hoines on the site. Two of these hornes will remain and one will be demolished. There are three new <br /> homes proposed to be built. The additional storm water runoff from the added impervious area will <br /> be treated and stored in vegetated swales and rain garde�is. <br /> Tl�e proposed storrn water release offsite from this syste�n is control(ed to be less than ti�e existiug <br /> condition. The runoff quantities for the existing and proposed conditions for the 2, 10, aud 100-year <br /> storm are shown in the attached HydroCAD calculations. The existing runoff for the 100-year storm <br /> is 5.56 cfs. <br /> Summaries of our f ndings are: <br /> • T'he 100-year storm existing runoff is 5.56 cfs. <br /> • The 100-year storm proposed runoff is 5.07 cfs. <br /> • The East Rain Garden will be 1400 cf aiid have a 12" culvert with a 10" orifice plate to <br /> control the rate of storm water release frotn the site. <br /> • The NW Rain Garden wilI be 500 cf and have a 12"culvert with an 8"orifice plate to control <br /> the rate of storm water release from the site. <br /> • The Central Rain Garden will be 550 cf and will infiitrate all treated water. <br /> • The South Raii� Garden will be 1200 cf and will infiltrate all treated water. • <br /> All storm tivater calculations and drainage maps ace included in this submittal. If you have questions <br /> about any of these calculations or anything else please contact Mike St. Martin or me. <br /> Sincerely, <br /> L UC S ASSOCIA �S <br /> 8 , / � . <br /> ,,: <br /> '� SSOCIA�i <br /> N cholas Mannel `.�:�!!�::�r.:_�,,;^,,"�;..".,::�".:,��+::?,�. <br /> cc: Janice Gundlach,City of Oi•ono � � � <br /> . ::,..:..�.. <br />